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99 lines
3.2 KiB
Plaintext
99 lines
3.2 KiB
Plaintext
NAME
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newerror - create or recall a user defined error condition
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SYNOPSIS
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newerror([str])
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TYPES
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str string
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return error-value
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DESCRIPTION
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If str is not "" and has not earlier been used as an argument for
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this function, newerror(str) creates a new described error-value so
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that any future use of newerror(str) with the same str will return
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the same error-value.
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When this function is called, the global calc error count (see
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help errcount) is incremented. If the global calc error count
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exceeds the maximum count (see help errmax), any ongoing calc
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execution is aborted.
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If x = newerror(str), both strerror(x) and strerror(iserro(x)) will
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return str and iserror(x) will return the error code value of the
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new error.
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The null cases newerror() and newerror("") are equivalent to
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newerror("???").
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EXAMPLE
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Note that by default, errmax() is 0 so unless errmax() is
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increased you will get:
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; ba = newerror("curds n' whey");
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Error 20000 caused errcount to exceed errmax
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; errmax(errcount()+5)
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0
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; e1 = newerror("triangle side length <= 0")
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; iserror(e1)
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20000
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; error(20000)
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Error E_20000
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; strerror(error(20000))
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"triangle side length <= 0"
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; strerror(e1);
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"triangle side length <= 0"
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; strerror(error(iserror(e1)))
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"triangle side length <= 0"
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; define area(a,b,c) {
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;; local s;
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;; if (!(a > 0) || !(b > 0) || !(c > 0)) return e1;
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;; s = (a + b + c)/2;
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;; if (s <= a || s <= b || s <= c) return newerror("Non-triangle sides");
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;; return sqrt(s * (s - a) * (s - b) * (s - c));
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;; }
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"area" defined
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; A = area(8,2,5);
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; if (iserror(A)) print strerror(A) : ":", iserror(A);
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Non-triangle sides: 20001
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; A = area(-3,4,5)
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; if (iserror(A)) print strerror(A) : ":", iserror(A);
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triangle side length <= 0: 20000
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LIMITS
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The number of new described error-values is not to exceed E__USERMAX-E__USERDEF
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(which is usually 12767 calls to the newerror function).
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LINK LIBRARY
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none
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SEE ALSO
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errcount, errmax, errno, errorcodes, errsym, iserror, stoponerror, strerror
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## Copyright (C) 1999-2006,2023 Landon Curt Noll
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##
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## Calc is open software; you can redistribute it and/or modify it under
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## the terms of the version 2.1 of the GNU Lesser General Public License
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## as published by the Free Software Foundation.
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##
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## Calc is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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## Public License for more details.
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##
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## A copy of version 2.1 of the GNU Lesser General Public License is
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## distributed with calc under the filename COPYING-LGPL. You should have
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## received a copy with calc; if not, write to Free Software Foundation, Inc.
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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## Under source code control: 1996/04/30 03:39:56
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## File existed as early as: 1996
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##
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## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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